package com.lagou.dao.impl;

import com.lagou.dao.CourseContentDao;
import com.lagou.pojo.Course;
import com.lagou.pojo.Course_Lesson;
import com.lagou.pojo.Course_Section;
import com.lagou.utils.DateUtils;
import com.lagou.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import java.sql.SQLException;
import java.util.List;

/**
 * courseContentDao的实现类
 */
public class CourseContentDaoImpl implements CourseContentDao {

    //根据课程ID查询课程相关信息
    @Override
    public List<Course_Section> findSectionAndLessonByCourseId(int courseId) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            //2.编写SQL
            String sql = "SELECT\n" +
                    " id,\n" +
                    " course_id,\n" +
                    " section_name,\n" +
                    " description,\n" +
                    " order_num,\n" +
                    " STATUS\n" +
                    " FROM course_section WHERE course_id=?;";
            //3.执行查询
            List<Course_Section> sectionList = qr.query(sql, new BeanListHandler<Course_Section>(Course_Section.class), courseId);

            //4.根据章节ID查询课时信息
            for (Course_Section section : sectionList) {
                //调用方法 获取章节对应的课时
                List<Course_Lesson> lessonList = findLessonBySectionId(section.getId());
                //将课时数据封装到章节对象中
                section.setLessonList(lessonList);
            }
            return sectionList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    @Override
    public List<Course_Lesson> findLessonBySectionId(int sectionId) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = "SELECT \n" +
                    " id,\n" +
                    " course_id,\n" +
                    " section_id,\n" +
                    " theme,\n" +
                    " duration,\n" +
                    " is_free,\n" +
                    " order_num,\n" +
                    " STATUS\n" +
                    "FROM course_lesson WHERE section_id=?";
            List<Course_Lesson> lessonList = qr.query(sql, new BeanListHandler<Course_Lesson>(Course_Lesson.class), sectionId);
            return lessonList;
        } catch (SQLException e) {
            e.printStackTrace();
            return null;
        }
    }

    //根据课程id回显课程信息
    @Override
    public Course findCourseByCourseId(int courseId) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "SELECT id,course_name FROM course WHERE id = ?";

            Course course = qr.query(sql, new BeanHandler<Course>(Course.class), courseId);

            return course;
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

    //保存章节信息
    @Override
    public int saveSection(Course_Section section) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = " INSERT INTO course_section(\n" +
                    "course_id,\n" +
                    "section_name,\n" +
                    "description,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time) VALUES(?,?,?,?,?,?,?);";
            Object[] param = {section.getCourse_id(), section.getSection_name(), section.getDescription(),
                    section.getOrder_num(), section.getStatus(), section.getCreate_time(), section.getUpdate_time()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节
    @Override
    public int updateSection(Course_Section section) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_Section SET\n" +
                    "section_name=?,\n" +
                    "description=?,\n" +
                    "order_num=?,\n" +
                    "update_time=? WHERE id=?";

            Object[] param = {section.getSection_name(), section.getDescription(), section.getOrder_num(), section.getUpdate_time(), section.getId()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改章节状态
    @Override
    public int updateSectionStatus(int id, int status) {
        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_section SET STATUS=?,update_time=? WHERE id=?";

            Object[] param = {status, DateUtils.getDateFormart(), id};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //保存课时信息
    @Override
    public int saveLesson(Course_Lesson lesson) {
        try {
            //1.创建QueryRunner
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());
            String sql = " INSERT INTO course_lesson(\n" +
                    "course_id,\n" +
                    "section_id,\n" +
                    "theme,\n" +
                    "duration,\n" +
                    "is_free,\n" +
                    "order_num,\n" +
                    "STATUS,\n" +
                    "create_time,\n" +
                    "update_time\n" +
                    ") VALUES(?,?,?,?,?,?,?,?,?);";
            Object[] param = {lesson.getCourse_id(), lesson.getSection_id(), lesson.getTheme(), lesson.getDuration(),
                    lesson.getIs_free(), lesson.getOrderNum(), lesson.getStatus(), lesson.getCreate_time(), lesson.getUpdate_time()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }
    }

    //修改课时
    @Override
    public int updateLesson(Course_Lesson lesson) {

        try {
            QueryRunner qr = new QueryRunner(DruidUtils.getDataSource());

            String sql = "UPDATE course_lesson SET \n" +
                    "theme=?,\n" +
                    "duration=?,\n" +
                    "is_free=?,\n" +
                    "order_num=?,\n" +
                    "update_time=? WHERE id=?";

            Object[] param = {lesson.getTheme(), lesson.getDuration(), lesson.getIs_free(),
                    lesson.getOrderNum(), lesson.getUpdate_time(), lesson.getId()};

            int row = qr.update(sql, param);
            return row;
        } catch (SQLException e) {
            e.printStackTrace();
            return 0;
        }

    }
}
